Abstract:
A cascading selective microwave isolator includes a set of Josephson devices (110), each Josephson device (110) in the set having a corresponding operating bandwidth of microwave frequencies. Different operating bandwidths have different corresponding center frequencies. A series coupling is formed between first Josephson device (110) from the set and an n th Josephson device from the set. The series coupling causes the first Josephson device to isolate a signal at a first frequency from a frequency multiplexed microwave signal in a first signal flow direction through the series coupling and the n th Josephson device to isolate a signal of an n th frequency in a second signal flow direction through the series, where the second signal flow direction is opposite of the first signal flow direction.
Abstract:
Microphone devices are disclosed. The microphone device includes a base, a lid, a side wall between the base and the lid, and a MEMS die. The side wall includes a first portion with a first width and a second portion with a second width disposed under the first portion. The first width is less than the second width such that a shoulder is formed on the second portion. The MEMS die is supported on the shoulder. The MEMS die includes a diaphragm and a back plate.
Abstract:
An electrical circuit assembly can include a semiconductor integrated circuit, such as fabricated including CMOS devices. A first lateral-mode resonator can be fabricated upon a surface of the semiconductor integrated circuit, such as including a deposited acoustic energy storage layer including a semiconductor material, a deposited piezoelectric layer acoustically coupled to the deposited acoustic energy storage layer, and a first conductive region electrically coupled to the deposited piezoelectric layer and electrically coupled to the semiconductor integrated circuit. The semiconductor integrated circuit can include one or more transistor structures, such as fabricated prior to fabrication of the lateral-mode resonator. Fabrication of the lateral-mode resonator can include low-temperature processing specified to avoid disrupting operational characteristics of the transistor structures.
Abstract:
Systems and methods for compensating for a non-linear characteristic of a non-linear filter (30) in a transmit chain of a transmitter (28) using predistortion are disclosed. In one embodiment, a transmitter includes a power amplifier (36) configured to amplify a radio frequency input signal to provide an amplified radio frequency signal, a non-linear filter (30) configured to filter the amplified radio frequency signal to provide an output signal of the transmitter, and a predistorter (64) configured effect predistortion of the amplified radio frequency signal, where the predistortion compensates for a non-linear characteristic of the non-linear filter (30). In this manner, the output signal is as if the non-linear filter were a linear, or substantially liner, filter. The predistortion applied by the predistorter may be fixed or adaptive.
Abstract:
La présente invention concerne un filtre stop bande actif comprenant une entrée de filtre et une sortie de filtre reliées par une ligne de transmission LT, un résonateur RE couplé à la ligne de transmission et connectable à une impédance de charge (Q1, L, R, C; C; Varactor). Entre le résonateur et l'impédance de charge, est monté un moyen d'activation (CM, diode PIN) de la fonction de filtrage dans une bande de fonctionnement choisie. Le filtre est utilisable dans des terminaux multistandards.
Abstract:
Dynamic power-scaling optimizes the power consumption of analog signal processors according to the signal level. The system includes dynamic gain allocation, dynamic impedance scaling and dynamic biasing. Even though the system structure changes dynamically, there are no transients at the output of the system. Moreover, the dynamic changes are immune to the presence of interferers. It has been implemented in a fifth order channel-select filter for a zero-IF GSM receiver.
Abstract:
A low-noise filter for a wireless receiver is disclosed. The low-noise filter comprises an amplifier and a filter comprising a frequency dependent negative resistance implemented using a general impedance converter to realize a bi-quad filter. The low-noise filter is implemented such that noise generated by the filter when an in-band signal is processed is prevented from appearing at the output of the amplifier stage.